INGREDIENTS
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5 onions, finely chopped
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12 lasagna noodles, cooked according to package directions
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1 stick (1/2 cup) butter
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1/2 teaspoon salt
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1/2 teaspoon black pepper
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1 1/2 cups shredded Cheddar cheese
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6 cups warm seasoned mashed potatoes, store-bought or homemade*
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For homemade creamy mashed potatoes
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10 medium-sized potatoes (about 4 lbs), peeled and quartered
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1 cup whole milk
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1 cup sour cream
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1 stick (1/2 cup) butter
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2 teaspoons salt
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2 teaspoons pepper